(a) Relatively narrow seas or stretches of water between two close landmasses and connecting two larger bodies of water; (b) Deeper parts of a moving body of water (as bays, estuaries, or straits) through which the main current flows or which affords the best passage through an area otherwise too shallow to navigate. [Glossary of Geology, 4th ed.]

The Puget Sound Basin is a National Water Quality Assessment (NAWQA) Program study unit for studying the status, trends, and changes affecting the nation's water quality. Site links to data, publications, and results.